An Efficient Performance of OFDM-Shaped Symbol for 5G Green Communication Compared to FBMC

Afifi, Mohamed Yasin Ibrahim; Soliman, El Sayed; Ammar, A.

doi:10.25046/aj0506140

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…The STCshaped scheme for OOB reduction, PAPR reduction, CP elimination, and ISI reduction in wireless channels [22]. In addition to this, the STC-shaped scheme is used for green communication in another way [23]. In the STC scheme [20], the OFDM symbol is compressed by 50% without bandwidth excessing of the system.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement for DCO-OFDM and ACO-OFDM systems using symbol time compression

Ramadan

ElHalawany

Elbakry³

2023

Telecommun Syst

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Visible light communication (VLC) is now used to achieve high data rates. Opticalorthogonal frequency division multiplexing (O-OFDM) is a strong technique for intensity modulation and direct detection (IM-DD). Direct current biased O-OFDM (DCO-OFDM) and asymmetrically clipped O-OFDM are two modern O-OFDM systems that operate with IM-DD constraints (ACO-OFDM). Due to severe out of band interference, the DCO-OFDM and ACO-OFDM systems have a high peak to average power ratio (PAPR) and substantial adjacent channel interference (ACI) (OOB). Furthermore, as compared to bipolar OFDM systems, they obtain a greater chance of bit error. The combination of the STC scheme, symbol extension, and pulse shaping signal is presented in this paper for improving the performance of the O-OFDM system without affecting system throughput. This article also decreases the OOB, PAPR, and bit error rate (BER) of DCO-OFDM and ACO-OFDM systems. Further analytical analyses for the proposed systems, such as OOB, PAPR, and computing complexity, are obtained in this paper. The simulation results verify the analytical study of the proposed methods for OOB reduction and PAPR reduction. As compared to typical O-OFDM systems, the proposed shaped STC-DCO-OFDM scheme and the proposed shaped STC-ACO-OFDM scheme lower the OOB by about 40 dB and the PAPR by about 4 dB at the 10 -3 probability point of the complementary cumulative distribution function (CCDF). The proposed systems outperform existing O-OFDM systems under AWGN for the BPSK modulation scheme in terms of BER, and reduce the computational complexity.

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Section: Introductionmentioning

confidence: 99%

Performance improvement for DCO-OFDM and ACO-OFDM systems using symbol time compression

Ramadan

ElHalawany

Elbakry³

2023

Telecommun Syst

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Throughput improvement and PAPR reduction for OFDM-based VLC systems using an integrated STC-IMADJS technique

Elbakry¹,

Mohammed

Ismail

2022

Opt Quant Electron

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Visible light communication (VLC) is a technology that is currently being employed to achieve high data rates. Orthogonal frequency division multiplexing (OFDM) is a powerful scheme for intensity modulation and direct detection (IM-DD) that is becoming increasingly important. OFDM systems based on VLC are accomplished through the implementation of IM-DD constraints, including direct current biased optical OFDM (DCO-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM), and asymmetrically clipped DC-biased (ADO-OFDM), among others. The OFDM technique based on VLC is inefficient in terms of spectral efficiency and has a high peak to average power ratio (PAPR). In this article, the symbol time compression-image adjust (STC-IMADJS) technique will be proposed for throughput maximization and PAPR reduction in the DCO-OFDM, ACO-OFDM, and ADO-OFDM systems. Furthermore, the STC technique enables the simultaneous transmission of two sub-carriers through Walsh spreading codes without inference between them. As a result, the OFDM symbol has been reduced by 50%. The IMADJS strategy reduces the high PAPR of transmitted signals by compressing large signals and expanding small signals, as long as the average power level remains constant after compression. Therefore, the proposed STC-IMADJS technique doubles the throughput as well as significantly reduces the PAPR for OFDM systems based on VLC. The simulation results are performed using Matlab-2021a for 1024 sub-carriers. As a result, the simulation results show that the proposed technique reduces the PAPR by 3.7 dB ($$86\%$$ 86 % ), 8.16 dB ($$93\%$$ 93 % ), and 1.81 dB ($$20\%$$ 20 % ) for DCO-OFDM, ACO-OFDM, and ADO-OFDM systems respectively. Furthermore, the technique has a significantly lower computational complexity than conventional OFDM systems based on VLC. Finally, the measures of performance through this article are bit error rate and complementary cumulative distribution function.

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Symbol time compression for OFDM spectral efficiency in visible light communication

Elbakry,

Hashima,

El Halawany

2024

J. Phys.: Conf. Ser.

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In recent times, the visible light communication (VLC) schemes show high data rates capabilities. In intensity modulation and direct detection (IM-DD), the intensity of the light beam from a laser or LED is modulated directly by information bits, without requiring phase information. Various orthogonal frequency division multiplexing (OFDM) forms can be used to address channel distortions for IM/DD channels in VLC system. Those forms include asymmetrically clipped optical OFDM (ACO-OFDM) and direct current biased optical OFDM (DCO-OFDM). However, both DCO-OFDM and ACO-OFDM systems suffer from spectral in-efficiency. For the sake of improving the spectral efficiency of OFDM based on VLC, the symbol time compression (STC) scheme is presented in this work. Moreover, computational complexity analysis is derived. Montecarlo simulations show that the proposed system improves the throughput of the VLC OFDM system, albeit at the expense of the BER performance. Furthermore, the suggested systems exhibit a notable reduction in computational complexity in compared with to conventional systems.

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An Efficient Performance of OFDM-Shaped Symbol for 5G Green Communication Compared to FBMC

Cited by 4 publications

References 26 publications

Performance improvement for DCO-OFDM and ACO-OFDM systems using symbol time compression

Performance improvement for DCO-OFDM and ACO-OFDM systems using symbol time compression

Throughput improvement and PAPR reduction for OFDM-based VLC systems using an integrated STC-IMADJS technique

Symbol time compression for OFDM spectral efficiency in visible light communication

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